Insulating wall on inside

FreeBear

quattros said: The room under the bedroom is a garage and there carpet near the front 3/4 of the bedroom is cold and draughty so will have to look into that too

Once the room is empty, the first thing to do before insulating the walls is to lift the floorboards. Once they are up, seal any spots that may be causing the draughts and then fill the void with insulation. If you have 8" joists, a couple of rolls of 200mm insulation will be well worth the £34 and cut the heat loss dramatically. Once the floor is insulated, you can get cracking with the walls.

Jeepers_Creepers

And seal between the boards/sheets when you re-lay them, and finally around the wall perimeter under the skirting boards. SEAL THAT FLOOR OFF!

Jeepers_Creepers

quattros said:

Will have to empty the room and go from there and see where the drought is coming from .

Almost certainly from the stopcock having been turned off.

ic

How old is the house?  Has the house had cavity wall insulation installed?  Is the exterior brick work in good condition?